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NCHRP Project 17-35: Evaluation of Safety Strategies at Signalized Intersections



Evaluations of Low Cost Safety Improvements Pooled Fund Study (ELCSI–PFS)



  • The Evaluation of Low Cost Safety Improvements Pooled Fund Study (ELCSIPFS) has 38 State members and impacts the direction of safety research and its implementation nationwide.

  • The Development of Crash Modification Factors (DCMF) Program CMF Stakeholder Meeting will occur on May 28, 2014 at Turner-Fairbank Highway Research Center (TFHRC).

  • The ELCSIPFS 2014 Annual Technical Advisory Committee (TAC) meeting will take place on June 4 and  June 5, 2014 at TFHRC.

  • Phase VI, Pavement Safety Performance, of the ELCSIPFS is completed. This study will be published in the summer of 2014. An article for this study will be published in the July/August 2014 issue of “Public Roads.”
  • The DCMF white paper, “Enhancing Statistical Methodologies for Highway Safety Research – Impetus from FHWA,” is complete. This paper will be published in the summer of 2014.

  • The DCMF is conducting a study for CMF research needs. The findings will be shared at the May 28th CMF Stakeholder Meeting.

  • The DCMF will start a new study for Systemic Safety Improvements – Identification of Focus Crash Types and Risk Factors in cooperation with Federal Highway Administration (FHWA), Office of Safety. This study will begin in the summer of 2014.

The ELCSI–PFS is conducted under and supported by the Development of Crash Modification Factors (DCMF) programThe ELCSI–PFS, 38 State departments of transportation (DOTs) members provide technical feedback on priority safety improvement evaluations to the DCMF program for low- to high-cost improvements, and implement new safety improvements to facilitate evaluations.

The DCMF program provides research products such as new statistical methodologies, identification of focus crash types, and current and future crash modification factors (CMFs) research needs to support ELCSI–PFS efforts.

Objective: The goal of this research is to develop reliable estimates of the effectiveness of the safety improvements identified as strategies in the National Cooperative Highway Research Program (NCHRP) Report 500 Guidebooks. These estimates are determined by conducting scientifically rigorous before-and-after evaluations at sites in the United States where these strategies are being implemented.

Scope of Work:The scope of the ELCSI–PFS is to conduct a research project of the priority strategies in the NCHRP Report 500 Guides. A target of 20 strategies totaling $4.38 million over 5 years was originally planned for ELCSI–PFS in four phases. Currently, this study has outperformed its original goals, and has added four extra phases for a total of eight phases The original budget of $4.38 million remains the same. To provide reliable measures for effectiveness of various low-cost safety improvements, this study's performance period has been extended beyond 2017.

Resources: The data for this study will be gathered from States that either have already implemented the selected strategies or will implement the strategies over the next few years. The greater the number of States implementing the strategies, the faster the rate of "after" data collection, which shortens the total time required for each evaluation.

Methodology: The methodology used will typically be an Empirical Bayes evaluation, using before-and-after data to determine the effectiveness of the selected strategies in reducing the number and severity of crashes. The implementation of the strategies and the evalu ations will be staggered, grouping a small number of the evaluations together, as appropriate.

To support the ELCSI–PFS efforts, FHWA and the DCMF program conduct regular technical experts meetings in cooperation with the American Statistical Association (ASA) to identify new statistical methodologies and to improve and advance the current practices used in the development of safety performance functions (SPFs) and CMFs.

The image shows a map of the participating States. The States include Arkansas, Arizona, California, Colorado, Connecticut, Florida, Georgia, Iowa, Illinois, Indiana, Kansas, Kentucky, Louisiana, Massachusetts, Maryland, Michigan, Minnesota, Missouri, Montana, North Carolina, North Dakota, New Hampshire, New York, Ohio, Oklahoma, Pennsylvania, South Carolina, South Dakota, Tennessee, Texas, Utah, Virginia, and Wisconsin.

Participating States in the ELCSI–PFS.

Participating States: Alabama, Arizona, Arkansas, California, Colorado, Connecticut, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nevada, New Hampshire, New York, North Carolina, North Dakota, Oklahoma, Ohio, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Virginia, Washington State, and Wisconsin.

Strategy Selections: Currently, the ELCSI–PFS has eight phases (I–VIII). Strategies for all phases are selected through balloting conducted at the annual Technical Activity Committee (TAC) meetings.

Results and Applications: The goal of the ELCSI–PFS is to provide a CMF and benefit/cost economic analysis for each of the targeted safety strategies. The CMFs and the economic analyses will be used by the Department of Transportation (DOT) to plan for the implementation of these safety improvements. The goal is to learn and improve processes to assist in the field implementation of these safety strategies. The degree of success in the evaluation of each strategy will vary depending on the level of DOT support and the availability and reliability of the collected data.

The final result of the ELCSI–PFS will be published by FHWA. It will also serve as a resource for the Highway Safety Manual (HSM) and other technical publications.

Dissemination of Results: Please see the Publications and Other Resources links.

For more information contact:
Roya Amjadi, Research Highway Safety Specialist
Federal Highway Administration
Office of Safety Research and Development
6300 Georgetown Pike
McLean, VA 22101
Phone: 202–493–3383
Fax: 202–493–3374
Email: roya.amjadi@dot.gov


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